Incandescent-lamp lock



M. RACHLIN INCANDESCENT LAMP LOCK,

Filed March 9. 1922 v 1 25 2 \U a Z L.]

when/ml? Patented Dec. 30, 1924.

I UNITED STATES MAX nacnnriv, or i new YORK,

N. Y AssIeivon crown-HALF To SAMUEL M. GO D, oF NEW YORK, N. .Y.

INCANDESCENT-LAMP LOCK.

Application filed March 9, 1922. Serial 110. 54.2391.

To all whom it may concern:

Be it known that I, MAX BAOHLIN, a citizen of Russia, and resident of the city of New York, in the county of Kings and State 'of New York, have invented certain new and useful Improvements in Incandescent- Lamp. Locks, of" which the following is a specification.

The present invention relates to improvements in mechanisms for locking electric incandescent lamps to their sockets.

The main object of the invention is to provide a device of the type which is sim ple in construction, etficient in operation, durable in use, and one which necessitates very small changes only in the construction of both the socket and the lamp.

With these and other objects in view, which will more fully appear as the nature of the invention is better understood, the same consists in the combination, arrangement and construction of parts hereinafter described, pointed out in the appended claim and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and proportion of the several parts and details of construction within the scope of the ap pended claim, without departing from the spirit or sacrificing any of the advantages of the invention.

One of the many possible embodiments of the invention is illustrated in the accompanying drawings, in which Figure 1 is a vertical central section taken through a lamp socket constructed in accordance with the present invention, the lamp and the locking means being shown in elevation; Fig. 2 is a section taken on line 22 of Fig. 1; Fig. 3 is an elevation of the lamp socket; Fig. 4 is a sect-ion taken on line H of Fig. 1; and Fig. 5 is a section taken on line 5-5 of Fig. 1, on a larger scale.

In the drawings, the numeral indi cates a lamp socket, comprising an outer metallic shell 11, one end of which is closed by a metallic cap 12, which is attached to the said shell in any suitable manner. The shell and cap are lined by a barrel 13 and cap let of insulating material, and house an insulating block 15, to which is attached, in any preferred manner, a screw-threaded socket member 16. This socket member is connected in the well known manner with one of the circuit wires, the "other circuit wire being connected to a contact 17, which extends to the center of said socket member and is insulated therefrom. Aswitch is interposed in the circuit, said switch being mounted onthe insulating block, but is not shown" herein, nor have the circuit wires been shown, as these elements and their manner of connection are Well known. Into the socket member fits the screwthreaded base 18 of an incandescent lamp 19. Both the socket member and the lamp base are made of sheet metal.

So far described, the construction and operation of the elements are well known, the particular socket herein disclosed having been described for purposes of illustration only, the lock being applicable to sockets of other types, without departing from the invention. 7

The lock includes a bolt 20, which is longitudinally shiftable in a groove 21 in the insulating block 15. In alignment with this groove, there is formed in the inner face of the socket member 16 a longitudinal recess 22, with which is adapted to be brought into register a longitudinal recess 23 in the outer face of the lamp base 18. These recesses register, after the lamp base has been fully screwed into the socket member and the contact 18 on the said base abuts against the contact 17 on the insulating block 1.5. The bolt 20 is then adapted to be shifted into the recesses 22 and 23, it being of a thickness to prevent relative movement between the socket member and the lamp base, when in said recesses. To the outer end of the bolt is secured a pin 24:, that is seated in the slot 25 in a lever 26. This lever extends through registering slots 27 and 28 in the insulating barrel 13 and shell 11, respectively, and is plvoted at 29 to the said shell. The pivoted end of the lever is provided with a head 30, adapted to be engaged by a key 31. The head 30 is enclosed in a housing 32, which prevents the application of any tool but the proper key for operating the bolt.

The operation of this device is as follows: Assuming that the elements are in the positions shown in Figs. 1 and 2 of the drawings, it is obvious that the lamp cannot be disengaged from the socket member, by reason of the fact that the bolt 20 prevents relative rotary movement between the said two elements. In order to replace the lamp, it is necessary to insert the proper key into the housing 32 and turn thereby lamp base, respectively 7 After a new lamp has been inserted, the bolt is returned to the positions shown in Figs. 1 and 2 of the drawings, preventing 'purloin ing of the lamp or accidental disengagement of the contact 18 from the contact 17, which often occurs when the lamp is subjected to vibrations. i

-WV11at I claim is 2+ v r o A-lam-p socket comprising an insulating block, a screw-threaded socket member attached thereto having a longitudinal recess in its inner face and adapted to receive a screw-threaded incandescent lamp base having a longitudinalrecess in its outer face capable ofrbeing brought into alignment with said first-mentioned recess, a locking boltslidably mounted on said insulating block adapted to enter said two recesses when in registering positions, and a lever pivotally mountedon said socket engaging said locking bolt for seating and unseating, at will, said locking. bolt in-and from said recesses. g

' Signed at New York, in the county of New York and State of New York this 23rdday of February, A; D. 1922.

' MAX- RACHLIN' 

